Research On Dynamic Detection And Control Of Power System Harmonic

Harmonic eliminating is a major problem which power system is facing.With the increasingly demands of power quality in the industry and life,traditional static approach of harmonic eliminating has been unable to meet thedemands. People hope that there is a new dynamic approach to eliminateharmonics whose amplitude and frequency are changing all the time. The ActivePower Filter(APF) is one way of that. Because the quality of harmoniceliminating depends on the harmonic detection and the actual compensationcurrent control, it is more and more important to study the detection and controlof dynamic harmonic eliminating.This paper mainly studies the instantaneous reactive power algorithm,triangle carrier comparison control and deadbeat control. Considering the analysisof the effect of delay as the theme, this paper compares the existing controlalgorithms and presents new algorithms.First, the APF basic theories and improved instantaneous reactive powerdetection algorithm are introduced. Based on this algorithm, a new phase-lockedloop algorithm is presented which overcomes the shortcomings of traditional PLLand avoids the error of zero-crossing detection. Then, the triangle carriercomparison and deadbeat control algorithm are introduced. Based on thesealgorithms, the effects of delay to the stability and the quality of eliminating areanalyzed. To solve the effect of the delay, a new deadbeat control algorithm whichis based on adaptive predictor is presented. Again, based on the theories, thesealgorithms are simulated and compared with each other. The simulation provesthe high accuracy and responsiveness of the PLL and deadbeat algorithms thispaper presents. Finally, this paper abandons the traditional implementation inDigital Signal Processor (DSP), and presents a new way to use FieldProgrammable Gate Array (FPGA) to implement the algorithm. Based on theFPGA, some modules are designed and validated.